Tamper-resistant vehicle event recorder

• US 5,471,193 A
• Filed: 07/12/1993
• Issued: 11/28/1995
• Est. Priority Date: 07/12/1993
• Status: Expired due to Fees

• Current Assignee: Phillips Plastics Corporation
• Original Assignee: Phillips Plastics Corporation
• Inventors: Weinert, James A., Peterson, Francis C.
• Primary Examiner(s): Swarthout, Brent
• Assistant Examiner(s): TONG, NINA C
• Application Number:
  US08/090,327
• Time in Patent Office: 869 Days
• Field of Search: 340/438, 340/436, 340/439, 340/441, 340/825.15, 340/461, 340/945, 102/293, 102/202.5, 428/688, 364/424.04
• US Class Current: 340/438
• CPC Class Codes: B60R 21/0173 Diagnostic or recording means therefor
• CPC Class Codes: G01C 22/00 Measuring distance traversed on the ground by vehicles, persons, animals or other moving solid bodies, e.g. using odometers, using pedometers
• CPC Class Codes: G07C 5/0841 Registering performance data recording measured values G01D; information storage G11B

Abstract

A tamper-resistant vehicle event recorder having a combustible film on a polymeric substrate, an ignition mechanism for igniting the combustible coating and an activation mechanism connected to the ignition mechanism for activating the ignition mechanism in response to a vehicular event.

Claims

1. A temper-resistant vehicle event recorder comprising:

(a) a polymeric substrate;

(b) a combustible fuel coating on said polymeric substrate;

(c) an igniter for igniting said combustible fuel coating; and

(d) activation means connected to said igniter for activating the igniter in response to a vehicular event.

2. A tamper-resistant vehicle event recorder according to claim 1, wherein said combustible fuel coating is an ink having a combustible resin mixed with Benzoin.

3. A tamper-resistant vehicle event recorder according to claim 1, wherein said igniter is made from a conductive ink which has been mixed with a combustible dust, and wherein said igniter has a first terminal portion and a second terminal portion, connected by an igniter strip portion having a smaller cross sectional area than said first terminal portion and said second terminal portion.

4. A tamper-resistant vehicle event recorder according to claim 1, wherein said activation means comprises a battery coupled to a switch to send a current of one ampere through said igniter in response to the vehicular event.

5. A method for making a tamper-resistant vehicle event recorder comprising:

(a) providing a polymeric substrate with first and second sides;

(b) coating said first side of said polymeric substrate with an igniter for igniting a combustible film, said igniter having a first terminal portion and a second terminal portion, connected together by an igniter strip portion having a smaller cross sectional area than said first terminal portion or said second terminal portion;

(c) coating said first side of said polymeric substrate with a combustible fuel coating such that said combustible coating is in contact with said igniter strip portion of said igniter; and

(d) connecting said ignitor to an activation mechanism which is arranged and configured to send an electrical current of one ampere through said igniter upon the occurrence of a predetermined vehicular event.

6. A tamper-resistant vehicle event recorder comprising:

(a) a polymeric substrate;

(b) ignition means on said polymeric substrate having a first tapered terminal portion and a second tapered terminal portion, said first and second portions being connected by an igniter strip portion having a smaller cross-sectional area than either said first terminal portion or said second terminal portion;

(c) a combustible fuel coating on said polymeric substrate overlying said igniter strip portion of said igniter; and

(d) activation means connected to said igniter for activating the ignition means in response to a vehicular event.

7. A temper-resistant vehicle event recorder according to claim 6, wherein said igniter is made from a conductive ink mixture having approximately a 5 to 15% by weight combustible metal dust mixed with a conductive ink, said conductive ink mixture being silkscreened onto said polymeric substrate.

8. A tamper-resistant vehicle event recorder according to claim 7, wherein said conductive ink mixture is a 5 to 15% by weight aluminum dust mixed with a conductive silver ink.

9. A tamper-resistant vehicle event recorder according to claim 6, wherein said combustible coating is an ink having a combustible resin that has been mixed with 10% by weight benzoin.

10. A method for making a tamper-resistant vehicle event recorder comprising:

(a) providing a polymeric substrate with first and second sides;

(b) screen printing said first side of said polymeric substrate with a conductive ink mixture to form an igniter for igniting a combustible fuel layer, said igniter having a first terminal portion and a second terminal portion, and an igniter portion between said first terminal portion and said second terminal portion having a smaller cross-sectional area than either said first terminal portion or said second terminal portion;

(c) screen printing said first side of said polymeric substrate with a combustible fuel coating such that said combustible coating is in contact with said igniter portion of said igniter; and

(d) connecting said igniter to an activation mechanism which is arranged and configured to send an electrical current of at least one ampere through said igniter upon the occurrence of a predetermined vehicular event.